diff --git a/bin/xss-lock b/bin/xss-lock
index 4b96923..f28ecea 100755
--- a/bin/xss-lock
+++ b/bin/xss-lock
@@ -16,7 +16,7 @@ unconfigure() {
 case "$1" in
     start)
         configure
-        exec xss-lock -n "$me notify" -l $me lock
+        exec xss-lock -s ${XDG_SESSION_ID} -n "$me notify" -l $me lock
         ;;
     dim|notify)
         echo "$(date --rfc-3339=seconds) $me: notify: start"